Foldable bed

ABSTRACT

A foldable bed having a frame and a cover attached to the frame. The frame has two handles, four legs and two identical side beams which is linked with four pairs of scissoring bars. All parts are able to be solid therefore a strength thereof can be significantly increased and a noise bring by telescoping tubes may be eliminated.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a foldable bed, and more particularly, to afoldable bed having a strong structure.

2. Description of the Prior Art

Foldable beds have long been developed since they are easily conveyedand occupies smaller space when folded. A foldable bed is disclosed inU.S. patent application Ser. No. 11/987,688. The foldable bed has aframe having two identical side beams each having a pair of groovebeams, a first connector contained in a groove of each groove beam, anda leg pivotally connected to each groove beam through the firstconnector. This kind connection between the side beams and legs is notdesirable because each of the side beams must have a groove definedtherein. The groove will significantly decrease a strength of the sidebeam. And secondly, the groove-connector linkage is also not desirablebecause the connectors are under a great force and often break or selflock in actual use.

An improved foldable bed is disclosed in the U.S. patent applicationSer. No. 12/382,700. The side beams can be solid to increase thestrength but the foldable bed must have middle legs of a shape of a tubeand contain a telescoping leg therein. This structure of telescopingtubes decreases the strength of the middle legs since they must behollow. The structure also bring noise since each time in folding andexpanding, the telescoping tubes rub with each other.

BRIEF SUMMARY OF THE INVENTION

The main object of the invention is to provide a foldable bed which isboth able to be folded and expanded easily and strong.

Another object of the invention is to provide a foldable bed which issilent in folding and expanding.

In order to accomplish the above objects, the present invention providesa foldable bed having:

a frame having a left handle and a right handle, a first left side beamand a second left side beam pivotally connected to the left handle, afirst right side beam and a second right side beam pivotally connectedto the right handle, a first left, a second left, a first right, and asecond right leg respectively pivotally connected to the first left, thesecond left, the first right, and the second right side beam near a freeend of each the side beam, a first left, a second left, a first right,or a second right lower bar respectively pivotally connected to thefirst left, the second left, the first right or the second right legs inmiddle of each the leg, a first left, a second left, a first right, or asecond right upper bar respectively pivotally connected to a middle ofthe first left, the second left, the first right and the second rightside beam with an end thereof and respectively pivotally connected to afree end of the first left, the second left, the first right, and thesecond right lower bar with the other end thereof, a left peddling and aright peddling, a first left and a second left tilt bar each having oneend pivotally connected to the left peddling and a free end respectivelypivotally connected to a middle of the first left and the second leftupper bar, a first right and a second right tilt bars each having oneend pivotally connected to the right peddling and a free endrespectively pivotally connected to a middle of the first right and thesecond right upper bars, a first left, a second left, a first right, anda second right linking bars each having one end respectively pivotallyconnected to a middle of the first left, the second left, the firstright, or the second right tilt bars and a free end respectivelypivotally connected to the left and the right handles, a first end barpivotally connected to a free end of the first left side beam at one endthereof and to a free end of the first right leg at the other endthereof, an opposite first end bar pivotally connected to a free end ofthe first right side beam at one end thereof and to a free end of thefirst left leg at the other end thereof, the first and the oppositefirst end bars being hinged at about a middle portion hereof and able toscissor with respect to each other, a second end bar pivotally connectedto a free end of the second left side beam at one end thereof and to afree end of the second right leg at the other end thereof, an oppositesecond end bar pivotally connected to a free end of the second rightside beam at one end thereof and to a free end of the second left leg atthe other end thereof, the first and the opposite second end bars beinghinged at about a middle portion hereof and able to scissor with respectto each other, a first middle bar pivotally connected to the left handleat one end thereof and to a point of the first right tilt bar near theright foot at the other end thereof, an opposite first middle barpivotally connected to the right handle at one end thereof and to apoint of the first left tilt bar near the left peddling at the other endthereof, the first and the opposite first middle bars being hinged atabout a middle portion hereof and able to scissor with respect to eachother, a second middle bar pivotally connected to the left handle at oneend thereof and to a point of the second right tilt bar near the rightpeddling at the other end thereof, an opposite second middle barpivotally connected to the right handle at one end thereof and to apoint of the second left tilt bar near the left peddling at the otherend thereof, the first and the opposite second middle bars being hingedat about the middle portion hereof and able to scissor with respect toeach other; and,

-   -   a cover attached to the frame.

These and other objectives, features, and advantages of the presentinvention will become apparent from the following detailed description,the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the preferred embodiment of a foldablebed of the invention;

FIG. 2 is an enlarged perspective view of a frame of the foldable bedshown in FIG. 1;

FIG. 3 is an enlarged perspective view of the frame shown in FIG. 2showing a status of half folded; and,

FIG. 4 is an enlarged perspective view of the frame shown in FIG. 2showing a status of being folded.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIG. 1, it is a perspective view the preferredembodiment of a foldable bed 1 of the invention, showing a status of thefoldable bed 1 when it is expanded. The foldable bed 1 has a frame 2 anda cover 3 attached to the frame 2. The cover 3 acts as bedplate as thefoldable bed 1 is expanded.

As shown in FIG. 2, the frame 2 has a left handle 20 and a right handle20′, a first left side beam 21 a and a second left side beam 21 bpivotally connected to a left handle 20, and a first right side beam 21a′ and a second right side beam 21 b′ pivotally connected to a righthandle 20′.

A first left, a second left, a first right, or a second right leg 22 a,22 b, 22 a′, or 22 b′ is respectively pivotally connected to the firstleft, the second left, the first right, or the second right side beam 20a, 20 b, 20 a′ or 20 b′ near a free end of each side beam 20 a, 20 b, 20a′ or 20 b′. A first left, a second left, a first right, or a secondright lower bar 23 a, 23 b, 23 a′, or 23 b′ is respectively pivotallyconnected to the first left, the second left, the first right or thesecond right leg 22 a, 22 b, 22 a′, or 22 b′ in the middle of each leg22 a, 22 b, 22 a′, or 22 b′. A first left, a second left, a first right,or a second right upper bar 24 a, 24 b, 24 a′, or 24 b′ is respectivelypivotally connected to a middle of the first left, the second left, thefirst right or the second right side beam 20 a, 20 b, 20 a′ or 20 b′with an end thereof and respectively pivotally connected to a free endof the first left, the second left, the first right, or the second rightlower bar 23 a, 23 b, 23 a′, or 23 b′ with the other end thereof. Theframe 2 further has a left peddling 25 and a right peddling 25′. A firstleft and a second left tilt bar 26 a, 26 b each has one end pivotallyconnected to the left peddling 25 and a free end respectively pivotallyconnected to a middle of the first left and the second left upper bar 24a and 24 b. A first right and a second right tilt bar 26 a′, 26 b′ eachhas one end pivotally connected to the right peddling 25′ and a free endrespectively pivotally connected to a middle of the first right and thesecond right upper bar 24 a′ and 24 b′. A first left, a second left, afirst right, or a second right linking bar 27 a, 27 b, 27 a′, or 27 b′each has one end respectively pivotally connected to a middle of thefirst left, the second left, the first right, or the second right tiltbar 26 a, 26 b, 26 a′, or 26 b′ and a free end respectively pivotallyconnected to the left and the right handle 20 or 20′.

A first end bar 30 is pivotally connected to a free end of the firstleft side beam 21 a at one end thereof and to a free end of the firstright leg 22 a′ at the other end thereof. An opposite first end bar 30′is pivotally connected to a free end of the first right side beam 21 a′at one end thereof and to a free end of the first left leg 22 a at theother end thereof. The first and the opposite first end bars 30, 30′ arehinged at about the middle portion hereof and able to scissor withrespect to each other. A second end bar 31 is pivotally connected to afree end of the second left side beam 21 b at one end thereof and to afree end of the second right leg 22 b′ at the other end thereof. Anopposite second end bar 31′ is pivotally connected to a free end of thesecond right side beam 21 b′ at one end thereof and to a free end of thesecond left leg 22 b at the other end thereof. The first and theopposite second end bars 31, 31′ are hinged at about the middle portionhereof and able to scissor with respect to each other.

A first middle bar 32 is pivotally connected to the left handle 20 atone end thereof and to a point of the first right tilt bar 26 a′ nearthe right foot 25′ at the other end thereof. An opposite first middlebar 32′ is pivotally connected to the right handle 20′ at one endthereof and to a point of the first left tilt bar 26 a near the leftpeddling 25 at the other end thereof. The first and the opposite firstmiddle bars 32, 32′ are hinged at about the middle portion hereof andable to scissor with respect to each other. A second middle bar 33 ispivotally connected to the left handle 20 at one end thereof and to apoint of the second right tilt bar 26 b′ near the right peddling 25′ atthe other end thereof. An opposite second middle bar 33′ is pivotallyconnected to the right handle 20′ at one end thereof and to a point ofthe second left tilt bar 26 b near the left peddling 25 at the other endthereof. The first and the opposite second middle bars 33, 33′ arehinged at about the middle portion hereof and able to scissor withrespect to each other.

A sleeve 28 a, 28 b, 28 a′, or 28 b′ is provided covering on and beingslidable with respect to respect first left, second left, first right,or second right tilt bar 26 a, 26 b, 26 a′, or 26 b′ between respectfirst left, second left, first right, or second right linking bar 27 a,27 b, 27 a′, or 27 b′ and respect opposite first middle, opposite secondmiddle, first middle or second middle bar 32′, 33′, 32 or 33. Areinforcing bar 29 a, 29 b, 29 a′, or 29 b′ is pivotally connected toeach sleeve 28 a, 28 b, 28 a′, or 28 b′ at one end thereof and to amiddle of respect first left, second left, first right, or second rightlinking bar 27 a, 27 b, 27 a′, or 27 b′ at the other end thereof.

When a user needs to fold the foldable bed 1 of the invention, he isable to step on the left peddling 25 with one of his foot and then pullthe left handle 20 upward. The first and the second left side beam 21 aand 21 b will rotate round the left handle 20. The first and the secondleft tilt bar 26 a and 26 b will rotate round the left peddling 25 atthe same time under a pulling force from the first and the second rightlinking bars 27 a and 27 b. As shown in FIG. 3, the first and the secondleft upper bars 24 a and 24 b will rotate towards the first and thesecond left side beam 21 a and 21 b, respectively. For betterillustration of movement of the frame 2, the soft cover 3, which willaffect the operation of folding and expanding slightly, is not shown inthese FIGS. 2, 3 and 4. The first and the second left leg 22 a and 22 bwill be pulled to rotate towards the first and the second left side beam21 a and 21 b. When the foldable bed 1 is fully expanded as shown inFIGS. 1 and 2, the sleeves 28 a, 28 b, 28 a′ and 28 b′ are stopped byand rest on respect opposite first middle, opposite second middle, firstmiddle or second middle bars 32′, 33′, 32 or 33. In folding, the sleeves28 a, 28 b, 28 a′ and 28 b′ start to leave respect middle bars 32′, 33′,32 or 33, as shown in FIG. 3. When the user pull the handle 20 upward,each pair of end bars, including the first and the opposite first endbars 30, 30′, the second and the opposite second end bars 31, 31′, thefirst and the opposite first middle bars 32, 32′, and the second and theopposite second middle bars 33, 33′, will scissor upward. Meanwhile, theleft side and the right side of the frame 2 move towards each other.Keep pulling the handle 20, the foldable bed 1 is able to be fullyfolded, as shown in FIG. 4. A reverse operation will be able to expandthe foldable bed 1. The user is also able to fold and expand thefoldable bed 1 by stepping on the right peddling 25′ and pulling orpushing the right handle 20′.

From above description, it could be seen that without the grooved sidebeams and the telescoping tubes, the foldable bed 1 may have compact andstrong legs and side beams. And moreover, it is able to be more silentin operation.

One skilled in the art will understand that the embodiment of thepresent invention as shown in the drawings and described above isexemplary only and not intended to be limiting. It will thus be seenthat the objects of the present invention have been fully andeffectively accomplished. Its embodiments have been shown and describedfor the purposes of illustrating the functional and structuralprinciples of the present invention and is subject to change withoutdeparture from such principles. Therefore, this invention includes allmodifications encompassed within the spirit and scope of the followingclaims.

What is claimed is:
 1. A foldable bed comprising: a frame having a lefthandle and a right handle, a first left side beam and a second left sidebeam pivotally connected to said left handle, a first right side beamand a second right side beam pivotally connected to said right handle, afirst left, a second left, a first right, and a second right legrespectively pivotally connected to said first left, said second left,said first right, and said second right side beam near a free end ofeach said side beam, a first left, a second left, a first right, or asecond right lower bar respectively pivotally connected to said firstleft, said second left, said first right or said second right legs inmiddle of each said leg, a first left, a second left, a first right, ora second right upper bar respectively pivotally connected to a middle ofsaid first left, said second left, said first right and said secondright side beam with an end thereof and respectively pivotally connectedto a free end of said first left, said second left, said first right,and said second right lower bar with the other end thereof, a leftpeddling and a right peddling, a first left and a second left tilt bareach having one end pivotally connected to said left peddling and a freeend respectively pivotally connected to a middle of said first left andsaid second left upper bar, a first right and a second right tilt barseach having one end pivotally connected to said right peddling and afree end respectively pivotally connected to a middle of said firstright and said second right upper bars, a first left, a second left, afirst right, and a second right linking bars each having one endrespectively pivotally connected to a middle of said first left, saidsecond left, said first right, or said second right tilt bars and a freeend respectively pivotally connected to the left and the right handles,a first end bar pivotally connected to a free end of said first leftside beam at one end thereof and to a free end of said first right legat the other end thereof, an opposite first end bar pivotally connectedto a free end of said first right side beam at one end thereof and to afree end of said first left leg at the other end thereof, said first andsaid opposite first end bars being hinged at about a middle portionhereof and able to scissor with respect to each other, a second end barpivotally connected to a free end of said second left side beam at oneend thereof and to a free end of said second right leg at the other endthereof, an opposite second end bar pivotally connected to a free end ofsaid second right side beam at one end thereof and to a free end of saidsecond left leg at the other end thereof, said first and said oppositesecond end bars being hinged at about a middle portion hereof and ableto scissor with respect to each other, a first middle bar pivotallyconnected to said left handle at one end thereof and to a point of saidfirst right tilt bar near said right foot at the other end thereof, anopposite first middle bar pivotally connected to said right handle atone end thereof and to a point of said first left tilt bar near saidleft peddling at the other end thereof, said first and said oppositefirst middle bars being hinged at about a middle portion hereof and ableto scissor with respect to each other, a second middle bar pivotallyconnected to said left handle at one end thereof and to a point of saidsecond right tilt bar near said right peddling at the other end thereof,an opposite second middle bar pivotally connected to said right handleat one end thereof and to a point of said second left tilt bar near saidleft peddling at the other end thereof, said first and said oppositesecond middle bars being hinged at about the middle portion hereof andable to scissor with respect to each other; and, a cover attached to theframe.
 2. The foldable bed as claimed in claim 1, wherein said framefurther has sleeves covering on and being slidable with respect torespect said first left, second left, first right, or second right tiltbar between respect said first left, second left, first right, andsecond right linking bars and respect said opposite first middle,opposite second middle, first middle or second middle bars, andreinforcing bars pivotally connected to one of said sleeves at one endthereof and to a middle of respect first left, second left, first right,or second right linking bars at the other end thereof.